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From:	"xingqk" <xingqk AT yahoo DOT com DOT cn>
Newsgroups:	comp.os.msdos.djgpp
Subject:	compile problem using djgpp with nasm
Date:	Fri, 2 Apr 2004 11:10:55 +0800
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Reply-To:	djgpp AT delorie DOT com

Under DOS system using djgpp with nasm ,I'm tring to link two file together,

one is sys.o:

(nasm -f coff sys.asm -o sys.o)

anther is clock.o:

(gcc -Wall -ansi -pedantic-errors -nostdinc -fno-builtin -I ../include
kernel -c clock.c -o clock.o)

then link two file use ld,but produce the error:

clock.o(.text+0x2c):clock.c:undefined reference to `outb'

clock.o(.text+0x39):clock.c:undefined reference to `inb'



because these file have been compiled successfully under LINUX (gcc
nasm ),so the include file can not be wrong , I guess maybe the path symbol
¡°/¡±should be changed to ¡°\¡±,but not (djgpp recognized the symbol ¡°\¡±).
I also add ¡°_¡± before the symbol inb and outb in the file sys.asm, but it
doesn¡¯t work..



I list the symbol table of sys.o using the commond: nm sys.o

Then displaying the following information:

00000000 a .absolut

00000000 t .text

         U _inb

         U _ind

         U _inw

         U _outb

         U _outd

         U _outw

I found _inb and _outb are undefined type and have no address. Why?? I am
confused! Who can tell me please, thanks a lot.

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